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    </style></head><body><div id="header"><div id="title">WebPerfWG - Design call Sep 6th 2018 - minutes</div><div id="interval"><span></span></div></div><div id="contents"><style type="text/css">ol{margin:0;padding:0}table td,table th{padding:0}.c1{color:#000000;font-weight:400;text-decoration:none;vertical-align:baseline;font-size:11pt;font-family:"Arial";font-style:normal}.c5{color:#000000;font-weight:400;text-decoration:none;vertical-align:baseline;font-size:20pt;font-family:"Arial";font-style:normal}.c6{padding-top:18pt;padding-bottom:6pt;line-height:1.15;page-break-after:avoid;orphans:2;widows:2;text-align:left}.c8{color:#000000;font-weight:400;text-decoration:none;vertical-align:baseline;font-size:16pt;font-family:"Arial";font-style:normal}.c10{padding-top:20pt;padding-bottom:6pt;line-height:1.15;page-break-after:avoid;orphans:2;widows:2;text-align:left}.c0{padding-top:0pt;padding-bottom:0pt;line-height:1.15;orphans:2;widows:2;text-align:left}.c9{text-decoration-skip-ink:none;-webkit-text-decoration-skip:none;color:#1155cc;text-decoration:underline}.c7{background-color:#ffffff;max-width:468pt;padding:72pt 72pt 72pt 72pt}.c4{color:inherit;text-decoration:inherit}.c2{height:11pt}.c3{font-weight:700}.title{padding-top:0pt;color:#000000;font-size:26pt;padding-bottom:3pt;font-family:"Arial";line-height:1.15;page-break-after:avoid;orphans:2;widows:2;text-align:left}.subtitle{padding-top:0pt;color:#666666;font-size:15pt;padding-bottom:16pt;font-family:"Arial";line-height:1.15;page-break-after:avoid;orphans:2;widows:2;text-align:left}li{color:#000000;font-size:11pt;font-family:"Arial"}p{margin:0;color:#000000;font-size:11pt;font-family:"Arial"}h1{padding-top:20pt;color:#000000;font-size:20pt;padding-bottom:6pt;font-family:"Arial";line-height:1.15;page-break-after:avoid;orphans:2;widows:2;text-align:left}h2{padding-top:18pt;color:#000000;font-size:16pt;padding-bottom:6pt;font-family:"Arial";line-height:1.15;page-break-after:avoid;orphans:2;widows:2;text-align:left}h3{padding-top:16pt;color:#434343;font-size:14pt;padding-bottom:4pt;font-family:"Arial";line-height:1.15;page-break-after:avoid;orphans:2;widows:2;text-align:left}h4{padding-top:14pt;color:#666666;font-size:12pt;padding-bottom:4pt;font-family:"Arial";line-height:1.15;page-break-after:avoid;orphans:2;widows:2;text-align:left}h5{padding-top:12pt;color:#666666;font-size:11pt;padding-bottom:4pt;font-family:"Arial";line-height:1.15;page-break-after:avoid;orphans:2;widows:2;text-align:left}h6{padding-top:12pt;color:#666666;font-size:11pt;padding-bottom:4pt;font-family:"Arial";line-height:1.15;page-break-after:avoid;font-style:italic;orphans:2;widows:2;text-align:left}</style><div class="c7"><h2 class="c6" id="h.8e1rwkqzqn10"><span>September 6th @ 11 AM PST —&nbsp;Design</span></h2><p class="c0"><span class="c9"><a class="c4" href="https://www.google.com/url?q=https://docs.google.com/document/d/10dz_7QM5XCNsGeI63R864lF9gFqlqQD37B4q8Q46LMM/edit?pli%3D1%23heading%3Dh.4d24rgepjznb&amp;sa=D&amp;source=editors&amp;ust=1613255838911000&amp;usg=AOvVaw0jdJiTL1jCdzbxq0cuC8sx">Agenda</a></span></p><p class="c0 c2"><span class="c1"></span></p><p class="c0"><span class="c3">Present</span><span class="c1"><b></b>: Ilya Grigorik, Charlie Vazac, Panagiotis Astithas, Nic Jansma, Nicolás Peña, Doug Creager, Shubhie Panicker, Garrett Berg, Philip Walton, Tim Dresser, Ben Kelly, Yoav Weiss </span></p><p class="c0 c2"><span class="c1"></span></p><p class="c0"><span class="c3">Scribe</span><span class="c1"><b></b>: Yoav Weiss (mostly)</span></p><h1 class="c10" id="h.2bufdsx4exf6"><span class="c5">Minutes</span></h1><p class="c0 c2"><span class="c1"></span></p><p class="c0"><span class="c3">Ilya</span><span><b></b>: Meeting at TPAC, there’s a </span><span>link on the agenda</span><span class="c1">, please add topics you want to discuss</span></p><p class="c0"><span class="c1"><b>Next call</b>: September 20th - Triage call</span></p><p class="c0"><span>Still iterating on the charter, </span><span>waiting on feedback from Todd</span></p><p class="c0 c2"><span class="c1"></span></p><h2 class="c6" id="h.6yqscbxujs21"><span>Performance Observer </span><span class="c9"><a class="c4" href="https://www.google.com/url?q=https://docs.google.com/presentation/d/1m-0_XzLQCj1_8ROvek1Wd7J_n3XOORhIcGXZHUVsqxE/edit?usp%3Dsharing&amp;sa=D&amp;source=editors&amp;ust=1613255838912000&amp;usg=AOvVaw0r4fA9Q4xlUdqcAY2HxpQM">proposal</a></span></h2><p class="c0"><span class="c3">Nicolás</span><span class="c1"><b></b>: want entry type specific parameters for PO</span></p><p class="c0"><span class="c1">Currently have a dictionary and a `buffered` boolean.</span></p><p class="c0"><span class="c1">No way to pass parameters specific to long tasks (and other types).</span></p><p class="c0"><span class="c1">For long tasks we want to add a different threshold.</span></p><p class="c0"><span class="c1">Could have passed it by other means but it would have been confusing, and weird.</span></p><p class="c0"><span class="c1">The proposal is to also include parameter dictionaries for the different entry types, with their own parameters.</span></p><p class="c0"><span class="c1">Every time we would add a new entry type, we’d define a dictionary IDL that goes with</span></p><p class="c0"><span class="c1">Still not sure if entry types should include all the observed entry types, or including the parameters for them is enough.</span></p><p class="c0"><span class="c3">Tim</span><span class="c1"><b></b>: IIRC, no one shipped the buffered flag, so still reasonable to change</span></p><p class="c0"><span class="c3">Charlie</span><span class="c1"><b></b>: what if there’s a flag that applies to all entry types, do we include it for each dictionary?</span></p><p class="c0"><span class="c3">Nicolás</span><span class="c1"><b></b>: yes</span></p><p class="c0"><span class="c3">Yoav</span><span class="c1"><b></b>: maybe add an “all” dictionary to cover parameters that apply to all entries</span></p><p class="c0"><span class="c3">Charlie</span><span class="c1"><b></b>: using “all” also avoids collisions between parameters and dictionary names</span></p><p class="c0"><span class="c3">Nicolás</span><span class="c1"><b></b>: and specific entry parameters would override the “all” values</span></p><p class="c0"><span class="c3">Ilya</span><span class="c1"><b></b>: we can also name it “default” to make it clearer</span></p><p class="c0"><span class="c3">Phil</span><span class="c1"><b></b>: how common would it be for developers to want to register multiple observers with different options for the same entry type? Or would they create a single one with multiple different options?</span></p><p class="c0"><span class="c3">Nic</span><span class="c1"><b></b>: We’re registering 3 PO, each looking at a single entry type, with different callbacks for each. Try to keep them separate.</span></p><p class="c0"><span class="c3">Charlie</span><span class="c1"><b></b>: Do we also want to make the callbacks per entry type?</span></p><p class="c0"><span class="c1">&lt;discussion&gt; users can have complex (or simple) callbacks to this with large switch statements at the top&lt;/discussion&gt;</span></p><p class="c0"><span class="c3">Nicolás</span><span class="c1"><b></b>: main motivation is to have entry type specific parameters</span></p><p class="c0"><span class="c3">Nic</span><span class="c1"><b></b>: I like this proposal</span></p><p class="c0"><span class="c3">Tim</span><span class="c1"><b></b>: you can imagine a future where you have entry types that have similar parameters</span></p><p class="c0"><span class="c3">Nicolás</span><span class="c1"><b></b>: PR is already waiting for review</span></p><h2 class="c6" id="h.9pyrvkqum1cx"><span class="c9"><a class="c4" href="https://www.google.com/url?q=https://docs.google.com/presentation/d/1lqWh6rEnC0IqPq0yh7enAvW1LumxjhMdJO9reVI0-28/edit%23slide%3Did.g416a9628b7_0_153&amp;sa=D&amp;source=editors&amp;ust=1613255838913000&amp;usg=AOvVaw2GWxRtan3e47vMwu-UP-NU">Page Lifecycle</a></span></h2><p class="c0"><span class="c3">Shubhie</span><span class="c1"><b></b>: status is: API shipped in Chrome 68</span></p><p class="c0"><span class="c1">A few remaining issues, a few API changes that will improve usage</span></p><p class="c0"><span class="c1">The need for clientID and lostClientID would help with multiple tabs that some get discarded</span></p><p class="c0"><span class="c1">Also need to make IDB play nice with freezes</span></p><p class="c0"><span class="c1">Shipped in Android, experiments running on desktop</span></p><p class="c0"><span class="c1">Freezing on android was an incremental process</span></p><p class="c0"><span class="c1">Started with timers, then loading (tasks and resource fetches).</span></p><p class="c0"><span class="c1">Saw good network and some CPU savings</span></p><p class="c0"><span class="c1">Now experimenting with freezing all freezable task queues.</span></p><p class="c0"><span class="c1">Things shared with the entire process (e.g. V8 task queue) can’t be frozen</span></p><p class="c0"><span class="c1">We see significant CPU wins - 62% in Chrome 69</span></p><p class="c0"><span class="c1">Translates into battery savings</span></p><p class="c0"><span>Hard to see impact on top level metrics </span><span>along the way</span><span class="c1">, because we did freezing very incrementally on mobile (starting with timers, then loading, then more etc) so it was hard to see improvements on toplevel metrics; BUT we are seeing these improvements on toplevel metrics desktop (because it was not incrementally).. </span></p><p class="c0"><span class="c1">Now looking if we need to make it more aggressive</span></p><p class="c0"><span class="c1">Also exploring the feasibility of a BFcache - want perfect freezing even when going to the cache</span></p><p class="c0"><span class="c1">Freezing on desktop is still on beta. So far experiment looks good with savings on cpu, memory, etc</span></p><p class="c0"><span class="c1">May change once we hit stable</span></p><p class="c0"><span class="c1">memory savings all across the board</span></p><p class="c0"><span class="c1">Also seeing good improvements in foreground loading - 2-5% in FMP and FCP</span></p><p class="c0"><span class="c3">Ilya</span><span class="c1"><b></b>: did you share the stats with webkit?</span></p><p class="c0"><span class="c3">Shubhie</span><span class="c1">&nbsp;<b></b>: not yet.</span></p><p class="c0 c2"><span class="c1"></span></p><h2 class="c6" id="h.zaynqi7l2qx1"><span class="c9"><a class="c4" href="https://www.google.com/url?q=https://github.com/w3c/resource-timing/issues/162&amp;sa=D&amp;source=editors&amp;ust=1613255838915000&amp;usg=AOvVaw2jAfreP7-KvAHh7dB1EH44">PerformanceResourceTiming enhancements to measure service workers</a></span></h2><p class="c0"><span class="c3">Ben</span><span class="c1"><b></b>: Devs have difficulties seeing how the fetch event is handled inside the SW, and the timing spent in those operations. Seems like a small API change</span></p><p class="c0"><span class="c1">Add attributes to the RT entry and populate them if the resource was served from SW</span></p><p class="c0"><span>I’ve put </span><span class="c9"><a class="c4" href="https://www.google.com/url?q=https://github.com/w3c/resource-timing/issues/162%23issuecomment-418764525&amp;sa=D&amp;source=editors&amp;ust=1613255838915000&amp;usg=AOvVaw0h6CK7tVx4q8-4qZnAljXm">examples in the issue</a></span></p><p class="c0"><span class="c3">Yoav</span><span class="c1"><b></b>: Seems necessary. Also feels like an L3 thing</span></p><p class="c0"><span class="c3">Ben</span><span class="c1"><b></b>: I guess we could try out the API with an origin trial if the spec is not ready to accept this</span></p><p class="c0"><span class="c3">Ilya</span><span class="c1"><b></b>: There are also questions around TAO and what’s permitted to expose by default</span></p><p class="c0"><span class="c1"><b>Regarding urgency</b>: are there customers demanding it?</span></p><p class="c0"><span class="c3">Nic</span><span class="c1"><b></b>: we started to experiment with SW and SW instrumentation. Both for customers that have SW where we need to report on, as well as our own SW that we want to monitor. This would be great to get more insights into SW’s operation. Currently experimenting with other ways to get info out of SW.</span></p><p class="c0"><span class="c3">Phil</span><span class="c1"><b></b>: What about the more complex case where a navigation response is stitched together from cache, network etc? How would that be represented?</span></p><p class="c0"><span class="c3">Ben</span><span class="c1"><b></b>: Had a more complex proposal that was able to surface more information there. Some of this can be done with postMessage but it’s not super elegant, overlapping URLs are confusing as you have no request ID, no way to get the client handle. I guess it’s weighing code that does that in every app vs. common native API that does most things.</span></p><p class="c0"><span class="c3">Nic</span><span class="c1"><b></b>: things we ran into: what’s the cache strategy? Resource updates are currently not surfaced, even if can be postMessaged. </span></p><p class="c0"><span class="c3">Ben</span><span class="c1"><b></b>: I can come up with a better definition of the use case. Sounds like TPAC would be a good place to discuss that.</span></p><p class="c0"><span class="c3">Ilya</span><span class="c1"><b></b>: Generally this makes sense, but need to find the hidden complexities, and think about TAO and the security implications. Aiming for TPAC sounds good.</span></p><p class="c0"><span class="c3">Charlie</span><span class="c1"><b></b>: proposal really cool. Like the server timing comparison. Also, cache API is also accessible from DOM. This maybe a good use case to inject arbitrary info into RT entries</span></p><h2 class="c6" id="h.qeiakdd87hky"><span class="c8">Reporting API</span></h2><p class="c0"><span class="c1">See GitHub issues, we’ll tackle in next design call.</span></p><h2 class="c6" id="h.mben4ndmylvd"><span class="c8">Resource Timing</span></h2><p class="c0"><span><b>Issue</b>: </span><span class="c9"><a class="c4" href="https://www.google.com/url?q=https://github.com/w3c/resource-timing/pull/163&amp;sa=D&amp;source=editors&amp;ust=1613255838916000&amp;usg=AOvVaw0y9zlqP6fcJmDvUntlF86n">https://github.com/w3c/resource-timing/pull/163</a></span></p><p class="c0"><span class="c3">Yoav</span><span class="c1"><b></b>: I rewrote the algorithm for what happens when the buffer is full.</span></p><p class="c0"><span class="c1">&nbsp; … Nicolás reviewed and lgtm’ed, but Ryosuke had conflicting feedback</span></p><p class="c0"><span class="c1">&nbsp; … bufferfull event can fire multiple times</span></p><p class="c0"><span class="c1">&nbsp; … we have primary buffer that fills up, then we start filling up secondary buffer</span></p><p class="c0"><span class="c1">&nbsp; … in Safari: secondary buffer is initially unbound, but when copying entries over</span></p><p class="c0"><span class="c3">Panagiotis</span><span class="c1"><b></b>: we’ll get feedback from Mozilla.</span></p><p class="c0"><span class="c3">Tim</span><span class="c1"><b></b>: as long as the developer is using PerfObservers, this behavior is not a huge concern to me</span></p><p class="c0 c2"><span class="c1"></span></p><p class="c0 c2"><span class="c1"></span></p><p class="c0 c2"><span class="c1"></span></p></div></div><div id="footer"><span>Published by <a target="_blank" title="Learn more about Google Drive" href="https://docs.google.com/">Google Drive</a></span><span class="dash">–</span><a href="https://docs.google.com/u/0/abuse?id=AKkXjozg02zeQLui1rCzcNe2ypegxhbUhIl5ZxKuPmnkzd5AQq03DT0BeFNl9aRUDkWefRK42VUiLpBpOadxNuo:0">Report Abuse</a></div><script type="text/javascript" nonce="">(function(){/*

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